ARM: tegra: Enable the mic-detect gpio on Acer Chromebook 13

Enables the gpio-base mic detection on the Acer Chromebook 13.  This
gpio is set by the jack-detection chip when it notices either of the
TRRS type headsets with a microphone.
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra124-nyan-big.dts

@@ -1131,6 +1131,8 @@ sound {
 		clock-names = "pll_a", "pll_a_out0", "mclk";
 
 		nvidia,hp-det-gpios = <&gpio TEGRA_GPIO(I, 7) GPIO_ACTIVE_HIGH>;
+		nvidia,mic-det-gpios =
+				<&gpio TEGRA_GPIO(R, 7) GPIO_ACTIVE_HIGH>;
 	};
 };